I'm wondering what happend to #Diaspora. Similar to Mastodon, it's a federated social network -- even the first of its kind? -- but has some features such as "circles". I havn't really used it for many years but my account on a german node still works. Props to the admins :-) I remember that I liked the community but disliked the UX. 10 years ago, things havn't changed much. Nice community, not so nice UX.
@duesee It is still alive!
joindaspora.com died sadly but there are still many other pods.
They are about to release version 1 that is a revamp of almost everything: API, account migration, improvements to the protocol... So really worthy to keep an eye on it!